Apparatus for returning water of condensation to steam-boilers



J. 1. AND G. E. ROYLE.

E. IIAIIsIIAvEs, H. c. o. scon AND a. L. RIDEHALGH. EXECUTORS or J- I. IIoY E. ozc'o,

APPARATUS FOR RETURNING WATER 0F CONDENSATION T0 STEAM BOILERS.

APPLICATION FILED SEPT-12,1917.

'1 ,333,735. 1 I Patented Mar. 16, 1920.

6 SHEETS-SHEET l.

J. LAND G. E. ROYLE. v

T E. HARGRAVES. H. c. 0. SCOTT AND (a. L. RIDEHALGH. EXECUTOBS or 1. 1. BOYLE. ozc'o,

APPARATUS FOR RETURNING WATER 0F CONDENSATION T0 STEAM BOILERS.

APPLICATION FILED SEPT-12,1917.

' Patented Mar. 16, 1920.

6 SHEETS-SHEET 2.

1.1. AND G E. ROYLE. I

E. HARGRAVES, H. c. n. SCOTT AND a. L. RlDEHALGH. EXECUTORS 0F 1. 1. ROYLE, own,

APPARATUS FOR RETURNING WAT-ER 0F CONDENSATION T0 STEAM BOILERS.

APPLICATION men SEPT. 12. 1917. 1,333,735;

6 SHEETS-SHEET 3.

Patented Mar. 16, 1920.

J. J. AND G. E. ROYLE.

E. HARGRAVES, H. c. 0. SCOTT AND a. L. momma. EXECUTORS or 1. 1. ROYLE, nac'n, APPARATUS FOR RETURNING WATER -0FCONDENSATION T0 STEAM BOILERS.

APPLICATION FILED SEPT-12.19M-

Patented Mar. 16, 1920.

6 SHEETS-SHEET 4.

J. J. AND G. ROYLE. HARGRAVES, H. C. D. SCOTT AND G- L- RIDEHALGH. EXECUTORS 0f 1. J- ROYLE. DEC'D,

APPARATUS- FOR RETURNING W ATER 0F CONDENSATION T0 STEAM BOILERS.

APPLICATION'FILED SEPT-12, 1917.

1,333,735. Patented Mar. 16, 1920.

e SHEETS-SHEET s.

EN-1S r ,14 i E .2 W '7 1/ 1 1 v JQW. 4

.J. J. AND G. E. ROYLE.

E. mun/was. H; c. n. SCOTT AND a. L. RIDEHALGH. EXECUTORS or 1. 1. ROYLE, nec'o,

APPARATUS FOR RETURNING WAT/[ R 0F CONDENSATION T0 STEAM BOILERS.

APPLICATIONHLED SEPT- 12, I917- Patented Mar. 16, 1920 6 SHEETS-SHEET 6.

' UNITED STATES P ENT I Join: JAMES BOYLE AND GEORGE n'nicnoy'nn, mainta n, NEAR MANCHESTER, ENGLAND; EDWIN HARGRAVES, HARRY-CHARLES Davin sco'rryn vn GEORGE.

LEWIS BIDVEHAVLGH, EXECUTQRS 0r sero- JOHN JAMES BOYL :DECEASED,

ASSIGNORS T0 ROYLES LIMITED, OF IRLAM, ENGLAND, A FIRMJ APPARATUS iron RETURNING WATER or coND NsATIon TO STEAM-BOILERS.

land, have invented Improvements in Appa? ratus for Returning water of Condensation to Steam-Boilers and for like Purposes, of

which the following is a specification.

This invention refers to new orimproved apparatus for-returning water of condensation tosteam" boilers and for like purposes, the saidapparatus being or the kind comprising high and low level vessels, in

the upper one of which are valves which are interconnected and, under the control of a fioat in the low level vessel, admit steam into the low level box and siinultaneouslyclose the passage for steam into the high level vessel, the said valves, under the control of afui'ther float in the high level vessel, opening the passage for steam into the high level vessel and shutting off steam to the low level vessel when. the water has been raised into the high level vessel.

"Apparatus ei'nbodying this invention is characterized. by a low level vessel provided,

th a steam inlet valve, controlled by afloat inside such vessel, further, by the absence of afloat or valves in the high level vessel, and

by the connections between the vessels being such that the sa d intermediate valves are operated directly by the pressure in the low level 'essel to shut off steam to the hi h I level vessel and open an exhaust outlet, sa d intermediate valvesopeuing the passage for steam to thehigh level vessel with adrop in pressure in the low level vessel. In this way coinpleted its movements.

; oi the inventionreside in the particular constructions and arrangements of partswherethe intermediate valves always. operate after the steam valve of the low level vesselhas Other features by a very reliable apparatus is produced.

I The improved apparatnsmay, in part, be

' used as a vacuum trap, and also as an 0rdi- V nary return steam trap, or as a super lifting Figure 1 illustrates, in elevation, the gen-' era'l arrangementotparts forming the im- Specification of Letters Patent- V Pittelltd lwlal' 16, Application filedSepte'niber 12,1917. Serial No. 196,950. I i i i proved apparatus 'as adapted for returning I I steam boiler water of condensation to a.

against boiler pressure.

Fig. 2 illustrates, to a larger, scale, a vertical section of the low level vessel, and of a v drip chainber combined therewith.

"Fig. 3 illustrates a sectional elevation of the valve mechanism used with the low level vessel, the main inlet valve and an auxiliary valvebeing shown closed and the exhaust valve open. v 1..

Fig. 4 illustrates a sectional elevation of "the lower, end of the valve fitting and part of the low level vessel, together with a side view of fioat operated tappet levers used for operatingthe auxiliary valve.

Fig. 5-illustrates a front view, partly ex.-

parts shown in Fig. 4.

Fig. 6" illustrates, to a larger scale, a; lonterior and partly sectional, of the same mechanism usedwiththe high level vessel.

' Fig.7 illustrates the invention as adapted,

- in part, for use as a vacuum.trap.

Referringto Fig. l, a is the low level ves- 'gitudinal sectionalelevation of o the valve Sel, usually made ;of cast iron, and b the high level. vesselalso usually made of cast iron or steel." As shown in Fig. 2,

a drip chamberc' mounted upon the vessel a, into which a series of drip pipesd may d'eliverIthe water requiring to-b f d t th r. The chamber 0 is held to the vessel a by'a flangedpipe c and afianged support 0 and forming an extension. of the pipe 0. is. a pipe a this latterextending down to a3 point near-the bottom of the vessel a, where it is fitted with a hinged flap valve 6 counter} weighted to remain normally closed and only to open under the 'weighteof water in the pipe and chamber a. To one end of the" vessel 0; is fitted the impro ved steam" nlet and exhaust valve mechanism, the vessel being cast with a hollow protuberance a through which: vertically extends the stem partf ofthe valve casing see F ig. 3, and

steam inlet valve 2' connected to or formedin one with a piston j, this latter being a sleek fit and having formed in it a small hole j. "In one with or connected to the valve -21 is'a spindle 70, which after extending upward through the stem part f of the valve casin is fitted with an exhaust valve Z. The position of this exhaust valve relatively to the inlet valved is such that when the valve is closed the valve Z uncovers the upper end of the stem part 7, while when the valve i fully open the valve Z closes the end-of the stem part. In one with the part IL .is a branch inlet it for the admission of live steam. T he part gis screwethreaded to re-ceivean exhaust outlet pipe g.'

At its lower end and below the-piston the valve fitting is provided with a small auxiliary valve 022- the passage m through which leads from the spacebelow the piston j to the atmosphere. The valve proper m is preferably arranged with its spindle m? at right angles to the: longitudinal axis of the valve 1., and the ends of the spindle ez-ztend outside the valve casing, as shown.

The valve passage m may extend vertically downward as shown in Fig. 3, but it will preferably extend partly downward and partly sidewise as shownin Figs. a and 5,

v in order to allow ot the connection of an exhaust pipe mi to the outletot the passage an. F or this purpose the valve body is formed with a lateral branch m the bore of: which opens into the valve chamber. The passage an opens into the main chamber through aperture m, p

/Vithin a further hollow protuberance a? on the end of the vessel a is journaled the axis at of a float 0, see Figs. 2, 4-. and 5. At each end the axis a ext-ends beyond the sides of the protuberance a? and is there fitted. with tappet levers p, 79 These levers are bent and overlie the protuberance a Fig. 5, and while the tree end of one lever: liesopposite one end of the spindle ot the valve m the free end of the other lever lies opposite the other end of the spindle of said valve. Further, the position of the levers on the axis a is such thatwhen one lever is touching the. valve spindle the other lies clear see Fig. 4:. The boss (7 of the float rod is formed with segn'ienta]. slots 9 and passing through the axis is a pin 1 the ends of which extend through the slots and a space being left between the hrahd one end of each slot; in order that the float in rising and falling "shall have a considerable move:

ment before acting upon the axis oz, and the tappet levers. Of course, by lengthening the protuberances a and (4 which will allow I nected by pipes 7" and r to the 'vesselb, see

Fig. 1'. The pipe 7" is also connected to the boiler.

h aust val ve Z.

steam boiler 8 via the pipe r and the usual non-return boiler feed valve .9, the arrangement being such that while the pipe r formsyin conjunction with pipe vg'th'e means of communication between the vessels d and b, it also forms in conjunction with the pipe T the means of communication between the lower part of the vessel 6 and the In the pipe 1" is fitted a non-return valve T In Fig. 6 is shown the steam inlet and exhaust outlet valve'mechanism of the high level vessel Z). such mechanism comprising a casino- 6 and the reversed valves 25, t these latter being connected one to the other. lVhile the valve 1 is adapted to control the passage of steam'irom the boiler into the top end of the vessel b, the valve t is adapted to allow of the vessel 7) being exhausted to atmosphere when the valve 6 is closed.

Depending from the lower part'of the like part c and an upper ring part c with raised grid-lilre center, the boss o of which is connected to the tube a. Between the said parts 2; and o" is clamped, by bolts and nuts, the edge of a flexible diaphragm w. Resting centrally upon. the diaphragm is a plate 0 the shape of the underside of which, and that of the upper face of the part c, being such as to insure of there being'as little of the diaphragm unsupported as possible. The plate 1. is a loose sliding fit within the part 1:. Connected at its lower-end to such plate is a spindle c" which extends through the tube a and at its upper end bears against the valve 1' the length of the rod being such that with'the diaphragm 1 at rest the valve 25 lies. on. its seating.

Connected with the upper part of the valve casing t a pipe 0: leading to the steam space of the boiler, see Fig. 1 while connected to the lower part of the valve it finds its way, through the hole j, into the space below the piston. and thereupon places the piston in equilibrium, and closes the valve i which simultaneously opens the ex- Water of condensatioinfor any other water required for the proper fccding of the boiler, is then. free to enter the vessel a viathc pipes (Z, chamber 0, pipe 0 and non-return valve 0. the float 0 rising with the risingwater line. 'W'hen the vessel ais about two-thirds full the float 0 acts upon the axis a to rotate the same and cause the tappet lever p to press against the spindle'm of the valve m? and push the Valve off 7 its seating. The opening of this valve serves to exhaust to atmosphere, by way of the passage m, the steam which has accumulated below the piston Theunderside of the piston being exhausted and the piston itself being of considerably larger area than the'valves i1 and Z, the piston falls partly by gravity but mainly by the pressure of the steam admitted through the connection it.

In thus moving down, the piston pulls the valve 2' off its seating, and thereby opens the way for the high pressure steamto enter the vessel a by way of the ports f.',.Simultaneously with the opening ofthe valve the valve Z is closed.

The first effect of the admission of the steam pressurejto the low level vessel. a is that this pressure is transmitted by way of the pipe O0 to the underside of the diaphragm w. The resulting upward mov'e ment of the diaphragm is communicated to the valves-t. and t by means of the connectingrod '0 This inovement closes-the valve t, thereb-y'isolat1ng the uppervessel bfrom the boiler steam space, and opensthe valve t which allows the vessel-b, which up to now containssteam atthe boiler pressure, to exhaust to atmosphere, or anytype of condenser. Theexhausting ot the vessel 6 now g allows of the water in the low level vessel (2 being forced up into the high level vessel 7) by means of the steam pressure admitted to the vessela in the manner before described,

by way of the pipe 7 thenon retuin valve r and the pipe 7',

, The resulting fall of the float 0 in the vessel a rotates the-axis n in a contrary direction, thereby bringing the tappet p into contact with the spindle m and thus closmg the valvem The escape of steam pressure from the underside of the piston y' now being stopped, the two sides of thepiston are rapidly put into equilibrium by'the steam passing around the sides of the piston and thr'oughthe bored hole 7". This causes the piston to be absolutely inactive'and the valve 6O valves t" and t ,-by =theboiler steam pressureacting'on the-top of the valve 6 through the pipe The I valve t'=:is thus opened and boiler steam atthe full boilerpressure ad- .mitted into the top of theihigh level" vessel i is carried upward to'its' seat by the pressure of the steam.-

The exhaust valjve lbeingconnected to the steam valve 2' by means e f-the rod is, the"ex'- haust valve Z is opened by the closing t the steam inlet valve 2', and the vessel a is exhausted to atmosphere, or tea condenser, by way of the exhaust pipe g.-

The exhausting-of the lower vessel calm mediately releases the pressure from theunderside of the diaphragm 7.0, which is forcedll, together with the rod 2, and v the 'b; Thiscre'ates an equilibrium of pressure between the boiler and the vessel Z) and the water in the vessel i) runs into the boiler by gravity byway of the pipeslr and r The exhausting of the lower vessel rt per- -mits the next charge to run in by the'pipe c :ironi the collecting vessel 0 whereit hasbeen accumulating. a 7' it is desirable that the opening ol the valve ishall be comparatively small and that of the valve Z comparatively large; Toallow of this the valve i-is formedwith a pis ton part, and a conical part, as shown, the

piston 'partonly uncovering, or covering the passage for the steam when the exhaust valve is half open, or closed.

In sha 'in the. )art Q) as shown and bv a l i a for use with condensers and other like-er paratus, working under a] vacuum. In this connection the drip chamber 0 may be disj pensed with; and the vessel a connected di rectly to the apparatus to be drained by )1 3e 1. The exhaust )1 e of the valve 1 J V fittin Wlll be connected to the vacuum anparatus so that a vacuum will be maintained in the interior of the vessel-after each discharge. The water will be dlscharged into a tank 2 or other suitable receiver through the pipe 9 and non-return valver The said low level vessel and its valve fittings may also beused as an ordinary return steam trap, 2 c., the vessel n'iay b arranged above the level of the boiler and the Water drained f directly into'the boiler when the steam at boiler pressure is "admitted into the ve sel (4. The said vessel and its valve fitting 1 also be used as a superlifting steam trz.p,

the water of condensation draining into the vessel. from a low pressure source and being liftedto an overhead tank by high pressure steam. In theselast named examples the I pipe 9 Wlll be open totheatmosphere.

. To prevent the steam directly striking the heat as it enters the vessel a, perforated pipe a may be provided, the perforations facing the top of the vessel, see 2.

it may here be noted. that the valve 2' lies between the piston j and the exhaust valve Z, an arrangement which allows of the valve casing 7 being in one piece and easily constructed. Further, the movement of the valve 2' away from the seating-results in the high; and lowlevel vessels, pipes valve Z being pulled on to its seating, and

vice .vorsa. .il] may also be noted that the ports f serve at one tune to admit live steam to the vessel sand at another time to c'on1- vey waste steam to the exhaust outlet.

Furtaer, by arranging the valves 2'- and-m noted is that the in when pushed (all? its seating has a slight pep, action 1', 0.,

it offers a slight resistance to the appet v I n lever and when such resistance is overcome moves quickly. Very positive action is thus insured both with the valves '5 and Z and the 'valvemP, any tendency oi the valves to stick or remain on a dead center, as in known apparatus for a like purpose, being. entirely absent in this invention.

What we claim is:- l. Boiler feed water apparatus comprising connecting the ves ds to each other and to the boiler, a steam inlet valve for the low level vessel, a float within the low level vessel torcontrolliwrsaid inlet valve, steam inlet and ex haus valves. for the high level vessel, a valve casing inclosing said last-named valves, an

open conduit connecting said casing with said low level vessel whereby the pressures obtaining 111 said low level vessel are communicated to said valve casing, and pres sure-controlled 11821115111 said casing tor controlling the valves of t ie high level vessel,

whereby the admission and cutting oil of.

steam to and from the low level vessel is directly controlled by said float and the admission and cuttingoil of steam to and from the high level vessel is indirectly controlled by said float through the latters control of the steam inlet valve for the low level vessel.

Boiler feed water apparatus con1prisin high and low level vessels, the low level vessel having a quicleacting float-controlled steam inlet valve, diaphragm-controlled steam inlet and exhaust va ves tor the high level vessel, pipe connections fitted with check valves between the two vessels and the boiler, and a further pipe connection between the low level vessel and the underside of the diaphragm, whereby the admission and cutting oil of the steam to and from the high level vessel is controlled by the valve in the low level vessel through the diaphragm-controlled valves, the latter operatalter the valve of the low level vessel has completed its movements, substantially as herein set forth.

3; In combination, a vessel havingwater inlet and outlet pipes provided with nonwhen the valve 2' requires to open.

either fully open.

return valves, valve mechanism for controlling the ingress and egress of steam into and out of the vessel, said mechanism comprising a valve casing,a steam inlet valve, an exhaust outlet valve, and a piston, the steam inlet valve being intermediate of the exhaust valve and piston, and the valves and piston being interconnected, said valve casing having a steam inlet branch intermediate'oi' the steam inlet valve and the piston, an'exhaust orifice at the end farthest from the piston, and steam ports intermediate of the inlet and exhaust valves leading to the interior of the said vessel, 3 an auxiliary valve, the spindle oi which'extends outside the valve casing at both eudS and said valve being adapted to open and close a passage leading to the atmosphere on that side of the piston farthest from the steam inlet valve, said passage communicating with the steam inlet through a small hole, a float within the said -1. l, and tappet levers adapted to be operd by the float,and,in turn, act upon the auxiliary valve spindle, asset forth.

4. In combination, a vessel. having water inlet and outlet pipes provided with nonreturn valves, avalve fitting at one end oli the vessel liorxcontrolling the ingress. and egress elf steam, said fitting comprising a vertically disposed casing, a steam inlet valve, an exhaust outlet valve and a piston, the inlet valve being arranged between'the exhaust valve and the piston,and the valves and piston being interconnected, said valve casing having a steam. inlet orifice inter mediate of the steam inlet valveand piston,

an exhaust outlet orifice at its upper end, and steam ports intermediate of the inlet and exhaust valves leading to the interior of the said vessel, an auxiliary valve i11- tegral with the said valve fitting, the spindle of the valve extending outside the valve casing at both ends, and said valve being adapted to open andclose a passage leading to the atmosphere on that side of the piston farthest from the steam inlet valve, said passage communicating with the steam inlet through a small hole, a float within said. vessel, anaxis. for said fioat journaled in one end of the vessel, and tappet levers on said axis with their free ends lying opposite the ends of the auxiliary valve spindle, and adapted with. the rise and fall of the float beyond predetermined limits to press upon the valve spindle and open orclose the auxiliary valve, as setforth.

5.. In combination, two vessels, one arrangedbelow the level of a steam boiler and the other above the level of such boiler, said low level vessel. having a water inlet pipe provided with a non-return valve, and also having valve mechanism comprising a valve casing, inlet and exhaust valves, and a pis ten, the valves and piston being interconnected and the inlet valve being intermedivalve which controls a'passage: leading toate of the exhaust valve and piston, said mechanisnr also comprising" an auxiliary the atmosphere on that side of the "piston farthest from the steam'inlet valve, said passage communicating with the steam inlet througha small hole, a float within the low 7 level vessel and float-operated tappet mechanism adapted with the rise and fall of the water in the low level vesselbeyond predetermined limits to open or CluSB the aux- I iliary'valve, a discharge pipe having a nonreturn valve extending, fronithe low level vessel to the high level vessel, a valve fitting, adjacent to the said upper vessel, comprising a valve casing and interconnected and reversedsteam inlet and exhaust outlet valves within said casing, the latter at its 'top end communicating with thesteam space of the boiler, at a point betweenthe inlet and exhaust valves communicating with the upper endof the highlevel vessel, and atits lowerend being formed with an exhaust outlet, said valve fitting also compris- .ing adiaphragm chamber and diaphragm,

a spindle between theidiaphragm and the exhaust valve, a pipe leading from beneaththe diaphragm'to the low level vessel, and a further pipe having a non-return valve between the dischargepipe of'the low leve vesseland the boiler, as set forth; I 6. In combination, two vessels, one arranged below the level of a steam boiler, and

the other above the level of such boiler, said low level vessel having a water inlet pipe provided with a non-return valve, and also having valve mechanism comprising a valve l casing, inlet and exhaust valves and a piston, the valves and piston beinginter-con- Vnected" and the inlet valve being intermediate of the exhaust valve and piston,

, said mechanism also comprising an auxilg l iary valve which controls; a passage leading-- 'to the atmosphere on; that side of thepiston farthest from the steam inlet valve, said passage being in communication with the steam inlet through a small hole, afloat within the low level vessel and'float-openated tappet mechanismvadapted with the rise and fall of the water in the low level vessel beyond predetermined limits 'to open or closethe auxiliary valve, a discharge pipe having a non return 'valveextending from the low level vessel to vthe high level vessel,

:1 valvefitting, adjacent to the said upper vessel, comprising anoutercasing and 1ll-' terconnected and reversed steam inlet and exhaust valveswithm said casing, this latter at itstop end communicating with the steam. spaceof the boiler, at apoint between. 1 I theinlet and exhaust valves communicat ing with the upper end of the high level vessel, and at its lower end formed with I an exhaust outlet, said valve fittingalso comprisingf diaphragm chamber aud -dim ph'ragm, the chamber being connected to'the valve ,casin'g by a tube fund said chamber comprising. a lower dishedpart and a gridlike upperpart, a-loose plate resting upon the diaphragm and shaped'onits underside to :the lower part, a rod resting upon such plate atit's lower end and extending at its other end to the underside of the exhaust valve of the valve fitting, a pipeleading from the underside-oi: the diaphragm to the low level vessel, and affurther pipe having a non-returnvalve between the discharge pipe of the low level vessel and the boiler, as set forth; v I

- 7. r In combination; a "vessel. having water inlett'and outlet pipes" provided with non return valves, valve,mechanism for'controli in'gthe ingress and egress of steamintolanjd out of the vessel, said mecllanisin comprising' a valve casing, a steam inlet valve, an,

exhaust outlet valve and a piston, thesteam inlet valve being intermediate of the exhaust :valve and piston, and the valves and piston being interconnected, said valve casing having a steam inlet branch intermediate of the orifice at the end farthest fromthe piston, and steam ports intermediate of the inlet and exhaust valves leading to the interior of the} said vessel, an auxiliary valve, the

' spindleof which extends outside the valve casing at both ends, and said valve being adapted to open and close apassage leading to the atmosphere onthat side of the piston farthest from the steam inlet valve, said passage communicating w th tllG'StflLlll inlet through a small hole,'.a fioat and float V i rod within said vessel, an axisfor saidi'loat rod journaled in one part of the vessel, the fioat rod' boss having segmental slots "and the axis having a pin, which extends through the slots, tappet levers on the axis, with their free ends lying opposite the ends of the auxiliary valve spindle, and ,adapted with the rise and fall of the floatbeyond predetermined limits to press upon the valve spindle and open or close the auxiliary valve, asset forth.

8. In combination, favessel havingwater; f

inlet and outlet pipes provided with nonreturn valves, and also having hollow m.

tuberances at one-"end, one above another, a

valve fitting comprising a tubular casing arrangedvertically in the upper protuberance and 'havin'g ports opening into said protuberance and said casing also having an 90 steam. inlet valve and the piston, an exhaust part of the casing, and a red connecting main steam inlet valve, an exhaust outlet valve and a p1ston,tl1evalves and piston 7 said exhaust andinlet valves together, a loose fitting piston also within the enlarged cylindrical part of the casing connected to the steam valve andhavinp; a small hole, an auxiliary valve below the piston, the ends of the valve spindle extending-outside the valve casing, and the valve being movable in a direction at rightangles to the longitudinal axis of the said steam valve and piston, and means whereby ivith'the rise and fall of the Water in the vessel beyond pre determined limits the auxiliary valve is opened and closed, as set forth.

9. In eombination, a vessel having Water inlet and outlet pipes provided with nonreturn valves, a valve fitting comprising a being movable as one, and the exhaust valve openmg when the inlet valve closes, said valve fitting also comprising a casing having an inlet branch for steam at a point between the main steam valve and piston, an auxiliary valve for controlling a passage between the piston and the atmosphere, said passage communicating with the steam inlet through a small aperture, and float-operated mechanism for controlling the said auxiliary valve, said main steam inlet valve being formed With a parallel-sided part and a conical part, and said parallel-sided part being adapted to slide in the valve casing and allow the exhaust valve to have a larger degree of opening than the inlet valve, as set forth; r V

In Witness whereof We have -hei'eu'nt0 set our hands in the presence of two Witnesses.

JOHN JAMES BOYLE. GEORGE ERIC BOYLE.

Witnesses: a

ERNALD SIMPSON Mosi LnY, MARioN EQOLAUD. 

